Does anybody know anything about this Case tractor

I am trying to learn whatever I can about this tractor I just purchased. It has three nameplates.

#1 Nameplate:
David Brown Tractors LTD.
Reduction Ratio 10/37
Tractor serial number 380\U227\11012698
Engine serial number 355041 2586

#2 Nameplate:
DAVIS
Davis Manufacturing
Division of JI Case
Model 380 RR
Product Id # 1143518

#3 Nameplate:
Rops Made for Case David Brown
Model 885 (380 series tractor)

The engine cover has CASE //////////////// DAVIS

It has a six way blade on the front with ROAD RUN'R 380 decal

Nothing on the back and no three point but it has a two speed PTO. I was told it had a trencher at one time.

It has a three-speed transmission with reverse. Has High, Low. High S, and Low S range selector on one lever. The HS and LS modes engage a hydraulic motor that runs the transmission very slow. It seems to be very high geared otherwise.

I would like to find an operators manual and spec manual to get the lube specs. I want to change all fluids but not sure what to put back in.

I welcome any information on this tractor.

Thank you in advance for any replies.

Cheers
Gary

Thank you Jim in Oregon.
I'm just north of you in Western Washington. The seller said he though it was a 1978. I just found a site with serial number look-up and this seems about right.

Thank you Richard in Nz.
Doesn't have front brakes or speedometer but probably should because this thing really has a lot of road speed.

Is the 10/37-reduction ratio common for these (seems high geared)?

Has anyone seen this transmission before?

It seems odd with only 3 speeds forward and one reverse. It has a hydraulic valve body with a tree position lever mounted where the three-point lever should be. This valve body has two hyd hoses going to a hyd motor mounted at the front of the transmission. When HS or LS one of the creep modes is selected (see picture) the drive train is disconnected behind the clutch and the hyd motor begins to drive the tractor in whatever speed or direction is selected (1,2,3,R). This three-position lever has forward, middle (neutral), and reverse with a speed-adjusting (bypass valve) valve. It creeps very very slowly almost too slow even with the highest possible gear combination selected. The clutch does not stop the tractor only the lever in neutral will stop it. It acts just like a hydraulic reverser (can be reversed on the fly).

Does anybody know how to adjust the speed of this hyd system?

I would like to get more creeping speed because first low is too fast and high creep is to slow for the fine work I want to do.

BTW this machine is in real good shape with only 523 hrs total tac time.

Thanks again

Cheers
Gary in Washington